Multi-stimuli responsive poly(amidoamine) dendrimers with peripheral N-dialkylaminoethyl carbamate moieties
| Autor: | Jun Wang, Qi-Song Tong, Qiu-Yue Huang, Wei Xu, Hua Huang, Hongjun Li, Jin-Zhi Du, Xiao-Xiao Shi, Ya-Ru Zhang |
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| Rok vydání: | 2019 |
| Předmět: |
Cloud point
Aqueous solution Polymers and Plastics Chemistry Organic Chemistry Bioengineering 02 engineering and technology Poly(amidoamine) 010402 general chemistry 021001 nanoscience & nanotechnology Smart material 01 natural sciences Biochemistry Combinatorial chemistry Lower critical solution temperature 0104 chemical sciences Dendrimer Proton NMR Solubility 0210 nano-technology |
| Zdroj: | Polymer Chemistry. 10:656-662 |
| ISSN: | 1759-9962 1759-9954 |
| DOI: | 10.1039/c8py01605d |
| Popis: | A novel type of multi-stimuli responsive dendrimer with thermo-, pH-, and CO2-responsiveness was developed through facile modification of polyamidoamine dendrimers (PAMAM) with various N-dialkylaminoethyl carbamate moieties. A series of modified PAMAM dendrimers with a well controlled structure were obtained and characterized by 1H NMR. The aqueous solutions of these dendrimers showed a lower critical solution temperature (LCST)-type thermoresponse, and their cloud point temperature (Tcp) was determined by turbidity measurements. Tcp was tunable from 8 to 70 °C, depending on the hydrophobicity and substitution number of the terminal N-dialkylaminoethyl groups, PAMAM generation, pH values, and salt concentrations. Additionally, the solubility of the resultant dendrimers could be reversibly modulated by alternately bubbling CO2 and argon. Our study offers a simple but effective approach to making new multi-stimuli responsive dendrimers for potential smart material applications. |
| Databáze: | OpenAIRE |
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